# CVE-2026-106072: CVE-2026-106072

Status: published. Published: 2026-10-23. Updated: 2026-11-02.

A flaw in Node.js TLS hostname verification allows a certificate with only a DNS SAN to authenticate an IP endpoint when the client connects using a non-canonical IPv4 spelling, such as `0177.0.0.1`, `0x7f.0.0.1`, `2130706433` or `127.1`.

`tls.checkServerIdentity()` did not classify these hosts as IP addresses, but normalized them to their canonical form and matched the result against the certificate DNS names. A certificate containing `DNS:127.0.0.1` and no `IP Address:127.0.0.1` SAN was therefore accepted, while the same certificate is correctly rejected for `127.0.0.1`. Exploitation requires a certificate with a numeric DNS SAN issued by a CA trusted by the client, and a platform resolver that accepts these spellings, such as glibc.

This vulnerability affects Node.js **26.x**, **24.x**, and **22.x**.

## Remediation

No remediation reported in collected sources

## Affected products and versions

- nodejs / node: ≥ 22.23.3; ≤ 22.23.3 (affected, semver); ≥ 24.22.0; ≤ 24.22.0 (affected, semver); ≥ 26.12.0; ≤ 26.12.0 (affected, semver). Source: CNA: hackerone

## Severity and prioritization

- CVSS 3.0: 6.7 (medium); CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L; source: CNA: hackerone

- CVSS 3.0: 6.7 (medium); CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:L; source: NVD: support@hackerone.com

- CISA KEV: No listing in collected sources

- EPSS: 0.62% as of 2026-11-02; percentile 49.55%

- SSVC: exploitation none; automatable no; technical impact total; source ADP: CISA-ADP

- Weaknesses: CWE-295

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://nodejs.org/en/blog/vulnerability/october-2026-security-releases (CNA: hackerone)

- https://nodejs.org/en/blog/vulnerability/october-2026-security-releases (support@hackerone.com)

## Provenance

- CNA: hackerone: https://www.cve.org/CVERecord?id=CVE-2026-106072; retrieved 2026-11-02; source updated 2026-11-02

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-106072; retrieved 2026-11-02; source updated 2026-11-02

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-106072; retrieved 2026-11-02; source updated Not reported

Revision: 4fb2622eb6968189c4616aa438bb8886189dcaea4325455d7ac3aac6f3c1cf86

Canonical: https://y2.dev/cve/CVE-2026-106072

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